Musk himself put in more than 90 percent of the money, according the Boring Company. The company said the rest came from early employees, with no involvement by venture capitalists or outside investors.

For what it’s worth, the filing lists two executive officers: Jared Birchall, who’s connected to another Musk-supported startup called Neuralink; and Steve Davis, who has served as director of advanced projects at SpaceX, one of Musk’s best-known companies (along with Tesla).

The Boring Company seemed like a lark when Musk unveiled it to the world last year. It built on his personal fascination with tunnels and rapid-transit schemes like the Hyperloop concept, and he said it took up only about 2 percent of his time.

A lot has happened since then:

Musk laid out a grand plan for transit tunnels not only between the San Francisco Bay Area and Los Angeles, but also between New York and Washington, D.C.

The Boring Company started carving out a tunnel in SpaceX’s parking lot in Hawthorne, Calif., and now it’s trying to do more digging beneath Los Angeles.

Maryland and D.C. officials gave their permission for the Boring Company to start working its way from Baltimore to Washington.

Chicago solicited proposals for a rapid-transit line linking the city center to O’Hare International Airport, and the Boring Company is one of two companies in the running.

Musk kicked off some eye-rolling campaigns to sell Boring-branded caps and flamethrowers (or non-flamethrowers, for regulatory purposes). He doubled down with a plan to sell Boring building bricks.

Those sales campaigns appear to be the only revenue generators to date. All the digging projects are being done without significant public funding, which suggests that Musk has already paid out millions to support the company’s employees and equipment purchases.

Last month, Musk shifted the focus of his tunnel vision to prioritize transporting pedestrians and bicyclists rather than cars. “It’s a matter of courtesy and fairness,” he explained in a tweet. “If someone can’t afford a car, they should go first.”

It’s not clear how long it will be before any of the Boring Company’s tunnels are open to the public, on foot, on bikes or in cars. But the $112.5 million appears to take the Boring Company out of the humorous-hobby category and put it in the serious-business category.

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